Lock.



E. G. BELKNAP.

LOOK.

APPLIUATION EILED 00T.18 1012,

Patented June 30, 1914.

et I onion.

LOCK.

Specification of Letters Patent.

Patented June 30, 1914.

Application filed October 18, 1812. Serial No. 726,538.

To all whom it may concern:

Be it known that I, EDWIN C. Bi-iLKNAP, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Locks, of which the following is a specification.

The present invention relates to a lock or catch adapted for use upon doors, windows, screens and analogous devices, and relates particularly to that style or type of lock or catch known as the friction type.

The objects of the present invention are, to provide a device of the class specified which is cheap and simple of construction and durable in usage, and which is so arof construction and combination of parts.

hereinafter described and claimed.

In the drawings, Figure 1 is a view showing a portion of a door or analogous device and the casing therefor in section, and the catch of the present invention in operative position; Fig. 2 a longitudinal section of the catch of the present invention; Fig. 3 an end view, and Fig. 4: a detail showing the method of, applying the catch along the lower edge of the door or similar device.

Referring now to the drawings, and Iparticularly to Figs. 1 and 2, the device as ilustrated comprises a barrel or casing 5, which is closed at its rear end 6 and open at the forward end 7. This casing or barrel is rovided with an interiorly' threaded surace 8, which receives a threaded surface 9 on the exterior of a sleeve 10, and said sleeve, as better shown perhaps in Fig. :2, has its forward end 11 contracted. Arranged within the sleeve 10 is a catch. member 12, which rojects beyond the open forward end 11 of t e sleeve 10 and is held in projected position through the medium of a coil spring 13 located within the barrel or casing 5. This catch member 12 is designated to enter u I r a recess 14 In a suitable StIllUXl, date is, which is secured to the jamb o. t 0 door, window or other article with which the catch is employed, and the barrel or casing 5 is preferably provided with a series of ribs 16 which prevents the barrel or casing from turning within its seat during operation.

It is obvious that when the door, window or other article is thrown or forced. into closed position the'catch member 12 will recede sufficiently during the closing operation to permit it to come into alinement with the opening it the striking plate 15, and when such 'alinement, has been reached the spring 13 will force the catch outward and into said opening, thereby holding the door, window or other article closed by a friction locking means.

As heretofore stated, the sleeve 10 and the barrel 5 are provided with exterior and interior threaded surfaces respectively. By the )rovision of these elements the sleeve 10 can e advanced or receded within the barrel 5 as desired. This advancement or recession of the sleeve 10 will obviously move the catch 12 inward or outward with respect to the forward, open end 7 of the casing 5, and

will increase or decrease the spring tension upon said catch, owing to the fact that as the catch member is moved in or out it will compress or release the spring 13 in accordance therewith. Thus an arrangement is provided which permits of an adjustment of the tension upon the catch member in conformity to the usage to which the device is put and the necessities thereof, or the adustment can be made in order to maintain a proper correlation between the striking plate and catch in conformity to the spacing of the door, window or other article from its jamb, and in conformity to the swelling or shrinking of the woodwork c'omposin said door, window or other article or jamb iiicrefor.

In order to readily permit the advancement or retraction ofthe sleeve'iO within the barrel 5., I show in the construction illustrated companion notches orjrecesses 17, of a nature to accommodate a suitable spanner wrench, and by means of the insertion of this simple tool in position the sleeve can be readily rotated to move it in or out of the barrel as desired; 7 I

In the form illustrated in Fig. t, suitable leaves or lugs 18 are rovided for the purpose of fastening the 'mrrel onto the lower end of a door or similar device. In this construction the latch member engages with a suitable detent attached to the wall or other portion of the structure against which the door or similar device swings when open.

It will be noted that however the sleeve 10 is adjusted the latch member 12 will always projectthe same distance beyond the open end 11 of said sleeve and hence there will be no difierence'in the locking efficiency of the catch, no matter may be.

I claim:

In a device of the class described, the com-- bination of a latch member, retalmng means therefor consisting solely of an outer section and an inner section, said outer section comprising a cup-shaped casing provided with an interiorly threaded surface and an outer marginal flange adapted to afiord an abutment for properly positioning the casing in place, said inner section consisting of an open ended sleeve teriorly threaded surfacemeshing with the interiorly threaded surface of the casing,

sleeveand projecting andheld against complete withdrawal bywhat the adjustment provided with an ex-- and having its outer end contracted to provide a rim formed to furnish an engaging surface for the application of an adjusting tool,"a catch member slidable within said outwardly therefrom the outer contracted rim of said sleeve, and a spring within the catch member outwardly from the sleeve, said inner section,

with respect to the outer face of the structure to which the lock is attached, and simultaneously varying the degree of the tension of the spring, whereby said tension is increased as the catch member is moved in ward and decreased as said member is moved outward, substantially as described.

' EDWIN C, BELKNAP. Witnesses:

WM. P. Born), THoMAs A. BANNING, Jr.

casing'for projecting the p when turned, moving in or out from the outer section, varying the degree of projection of the catch member, 

